Can the gyn doctor see if you have any stds from looking at your vaginal area when he does the pelvic exam?

Yes and No: Some STDs can be seen on visual inspection, and that is an important part of the exam. However, others will need specialized tests, such as a pap smear (looking for sequelae of the std hpv), and others still can be tested for with urine and blood tests.

Sometimes: There are some std's that cause vaginal discharge that can be quite distinctive on examination but usually you need confirmatory tests by looking under a microscope or doing a lab test to be sure. Some std's dont have any signs or symptoms in girls and the only way to diagnose them is to do a routine screen. For example gonorrhea and chlamydia are tested routinely in girls under 25 due to risks.

Some types: Warts (hpv active in the skin) are easy to see. Pubic lice can be seen. Other types of std's may require testing.